package com.lzm.service;

import com.lzm.mapper.UserMapper;
import com.lzm.pojo.User;
import com.lzm.pojo.UserExample;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.List;
import java.util.Random;

@Service
public class loginService {

    @Resource
    private UserMapper userMapper;

    public void service(HttpServletRequest request,
                        HttpServletResponse response) throws IOException, ServletException {
    //设置页面不缓存
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
    //在内存中创建图象
    int width = 60, height = 30;
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    //获取图形上下文
    Graphics g = image.getGraphics();
    //生成随机类
    Random random = new Random();
    //设定背景色
        g.setColor(getRandColor(220, 250));
        g.fillRect(0, 0, width, height);
    //设定字体
        g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
    //画边框
    //g.drawRect(0,0,width-1,height-1);
        g.draw3DRect(0,0,width-1,height-1,true);
    //随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(12);
        int yl = random.nextInt(12);
        g.drawLine(x, y, x + xl, y + yl);
    }
    // 取随机产生的认证码(6位数字)
    String sRand = "";
    String s = "012345678901234567890123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ012345678901234567890123456789abcdefghijklmnopqrstuvwxyz";
        for (int i = 0; i < 4; i++) {
        char rand =s.charAt(random.nextInt(s.length()));
        sRand += rand;
        // 将认证码显示到图象中
        g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
        //调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
        g.drawString(String.valueOf(rand), 13 * i + 6, 16);
    }
        g.drawOval(0,12,60,11);
    // 将认证码存入SESSION
        request.getSession().setAttribute("rand", sRand);
    // 图象生效
        g.dispose();
    ServletOutputStream output;
        try {
        output = response.getOutputStream();
        // 输出图象到页面
        ImageIO.write(image, "JPEG", output);
    } catch (
    IOException e) {
        e.printStackTrace();
    }
}

    /**
     * 生成随机颜色
     */
    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    @Transactional(propagation = Propagation.REQUIRED,rollbackFor = {Exception.class})
    public boolean login(String loginName,String loginPwd){
        boolean flag = false;
        UserExample example = new UserExample();
        UserExample.Criteria criteria = example.createCriteria();
        if(loginName!=null && loginPwd!=null){
            criteria.andUser_loginNameEqualTo(loginName);
            criteria.andUser_passWordEqualTo(loginPwd);
            List<User> admins = userMapper.selectByExample(example);
            admins.forEach(admins1 -> System.out.println(admins1));
            if(admins.size()!=0){
                flag=true;
            }else {
                flag=false;
            }
        }
        return flag;
    }

    @Transactional(propagation = Propagation.REQUIRED,rollbackFor = {Exception.class})
    public List<User> queryByName(String loginName){
        UserExample example = new UserExample();
        UserExample.Criteria criteria = example.createCriteria();
        criteria.andUser_loginNameEqualTo(loginName);
        List<User> admins = userMapper.selectByExample(example);
        return admins;
    }

}
